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Description

Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.

PUBLISHED Reserved 2026-06-02 | Published 2026-06-11 | Updated 2026-06-13 | Assigner VulnCheck




CRITICAL: 9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

CRITICAL: 9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Problem types

Missing Authentication for Critical Function

Product status

Default status
affected

Any version before 0.51.358
affected

Credits

Chia Min Jun Lennon finder

References

github.com/nesquena/hermes-webui/pull/3964 exploit

github.com/nesquena/hermes-webui/releases/tag/v0.51.358 release-notes

github.com/nesquena/hermes-webui/pull/3964 issue-tracking

github.com/nesquena/hermes-webui/pull/3973 issue-tracking

github.com/...ommit/1126e541325d401538f6a272a9c024c37d47ae08 patch

www.vulncheck.com/...ated-password-takeover-via-api-settings third-party-advisory

cve.org (CVE-2026-49973)

nvd.nist.gov (CVE-2026-49973)

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